Programmable logic controller



FIG. 1 is a front view of a first embodiment of a programmable logic controller, showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a front and left side perspective view thereof;

FIG. 8 is a front view of a second embodiment of a programmable logic controller, showing our new design;

FIG. 9 is a rear view thereof;

FIG. 10 is a top view thereof;

FIG. 11 is a bottom view thereof;

FIG. 12 is a right side view thereof;

FIG. 13 is a left side view thereof; and,

FIG. 14 is a front and left side perspective view thereof.

Portions of the article shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a programmable logic controller, as shown and described. 